Cash value life insurance is any life insurance contract that accumulates a value the policyholder can reach during life, in addition to paying a death benefit. The mechanism is the same across the family: each premium is reduced by an expense load and by the cost of insuring the risk, what remains is added to an account inside the contract, and the insurer credits that account, either at a guaranteed schedule of amounts, at a declared interest rate, at a rate derived from an index, or through investment subaccounts, depending on the product. It is the counterpart to term coverage, which prices a defined window of risk and accumulates nothing.
Two naming points are worth settling immediately. First, the phrase overlaps with permanent life insurance, and the two are not synonyms even though they usually describe the same policies. Permanent describes duration; cash value describes the savings component. Most permanent policies build cash value, but a guaranteed or no-lapse universal life policy is permanent coverage deliberately engineered to hold very little of it. Second, and more practically: actual cash value in a homeowners, renters or auto policy is an entirely different concept. There it means the depreciated value of damaged property, the basis on which a property claim is settled. It has nothing to do with life insurance, and a reader who arrived here from a property policy wants the actual cash value page instead.